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SubjectRe: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
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On 13/02/2018 11:53, David Woodhouse wrote:
>> You have my vote. :)  Really, IBRS_ALL makes no sense and it would be
>> nice to know _why_ Intel is pushing something that makes no sense.
> No, IBRS_ALL *does* make sense. It's not a complete fix, but it's as
> much of a fix as they should shoe-horn into the generation of CPUs
> which are currently going to the fabs.
>
> With IBRS_ALL they presumably add tags to the predictions with the VMX
> mode and ring, to give complete protection against predictions being
> used in a more privileged mode.

Yeah, but I still don't get why they need an MSR to turn those tags on.
Is it basically a chicken bit in the wrong direction?

Paolo

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